Lock



L. TREVISIIN March 1-9, 1935.

LOCK

Filed July 14, 1932 2 Sheets-Sheet 1 41 LUIGI TREK 1511)" I NVEN TOR.

Fig.2

ATTORNEY.

L. TREVlSlN March 19, 1935.

LOCK

2 Sheets-Sheet 2 Filed July 14, 1932 11! L rlllk Fill LUIGI TREVISIN INVENTOR.

. ATTORNEY.

Patented Mar. 19, 935

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UNITED :sT- TES PATEN o -mE I P 1 3:?

Luigi Trcvisim'New' York, N. Y.

Application July 14, 1932, Serial No. 622,483 V Claims; (01. 70-44 This invention relates to- -new and. useful improvements in locks and relates more particularly to'a combined key and: semi-permutationlock.

- One of the objects of theinvention is to provide a lock which is relatively simple in construction and which will provide means whereby the lock can be opened only byone familiar with the lock, the device being so constructed that ordinary manipulation of thekey will not actuate the bolt. g g The invention'also contemplates the provision of-a lock of this kind which may be readily opened by one instructed in its intricacies, the bolt being actuated only when the key is placed in the i proper position.

' Still'another object of the invention is the provisionof a lock which cannot be picked or opened without a-key, the key also being of an unconventional construction in order that'duplicates thereof cannot be readily made.

The invention further contemplates the provision of a lock of the kind above referred to which will provide'means for changing the keys at will in order that if a stranger should get possession ofthe key used and also have knowledge of the combination he nevertheless could not open the lock. i r

' I Other objects and advantages of the invention will be hereinafter specifically pointed out, orwill become apparent, as the specification proseeds.

' With the above indicated objects in view, the invention resides in certain novel-constructions, combinations and arrangements of parts,- clearly described in the following specification and fully Fig. 3 is a side elevation of the key for the lock.

Fig. 4 is a perspective View of the outer portion of the casi g, the View also showing the position of several of the parts of the device;

Fig. 5 is a 'perspectiveview of one of the parts ofthe device. I

Fig. 6 is a perspective View o f the inner key housing"; a 1

' Fig. '7 is a perspective view of the rear side of the following manner: A substantially L shaped Referring now. more particularly to the draw: ings whichillustrate the preferred embodiment oftheinvention, the device includes ajplate or base member 10 having a fianged'vertical "end portion llwhich is secured flush with the ver- 5 tical edge of the door to which the lock is secured. The vertical end portion 11 is provided with a rectangular aperture'12 through which themain portion 13 of the bolt structure 14; passes. This main portion of the bolt'structure, which is il-Z '0 lustrated detail in Fig. 7, isprovided with a vertical aperture 15 extending from the upper to the lower portion thereof, in which aperturea pair of conventional lock engaging fingers 16 are pivoted in such a fashion that when the bolt is retracted said fing-ersalso retract into the ap erture. The bolt structure is further provided with an extensionportion 17, said extension por-j tion having an elongated horizontal slot 18 theref in. The bolt structure'is guided by meansiof a screw 19 which passesthroughithe slot and. which is secured to the base platelO. 'Ihus'th'e bolt is; enabled totravel forwards and baclqivards the'length of theslot l8, allas hereinafter jde= scribed; v 1 f The bolt is adapted to be movedjinto three positions, one entirely retractedgione' partially extended and one fully extended, the latter posi'- tion being illustrated in Fig.1. Whenthe bolt is fullyretracted it is secured against movement" in locking member 20 whichis provided with ahorizontal extension portion 2i is pivotally secured I to the plateat 22, this member being urged up wards by means, of a flat spring 23f which'is mounted on the plate'at'2 l. The extension por 5 tion l'l'of the bolt is provided on its lower side with a notched portion 25 substantially midway between its ends, this notch being engaged by an extension portion 26 on the L shaped locking member 20 when the bolt structure is in a retracted position. This bolt is urged into theretracted p osition by means of a spring 27 which is mounted on a screw 28, the outerend of the spring engaging a post 29 at theiinner terminal of the bolt structure. 'The'cpposite end of the spring engagesa post- 30 mounted on the plate 10, said post also being engaged by the opposite end of the spring The preferred form of, key 3l-for the lock is illustrated in detail in Fig. 3 and is provided with a longitudinal I aperture 32 extending inwardly fromthe outer end thereof. 'Ihe'key also is pro- -Vid 'ed' witha'pair of spaced'teeth33 and 34 reinto this aperture which is normally closed by pin supporting member 36' secured to the rear side of the plate 10 and extends into the key hole (not illustrated) leading from the outer surface of the door. When the key is inserted in this key hole the pin 36 passes into the aperture 32 of the key and as the key is moved inwards the end thereof engages the surface of a key housing 3'7 which is illustrated in detail in Fig. 6, and which is secured to the plate 10. This plate is provided witha key aperture 38-and as the key is revolved to the point where the teeth thereof are adjacent to this aperture 38 the key may then be forced means of an apertured disc which is mounted on the pin 36 and is urged outward by means of a spring 41. Thus, a person notfamilia with the mechanism of the lock would not be aware of the position to which the key-must'be rotated before the teeth thereof may pass into the housing. If, however, both teeth of the key'pa'ss into the housing. the boltwillnot be moved; By inserting the'key just far enough, however, into the aperture to allow the outer tooth 33 thereof to pass into the housing and the adjacent tooth 34 to remain on the outside thereof, then rotation of the key in a'counter-clockwise direction will cause said tooth 34 to first engage the horizontal extension portion '21 of the L shaped locking member 20 thereby forcing it downward and releasing the extension portion 26 of the locking member from the notch portion 25 of the bolt. Further rotation of the key causes theouter tooth 33 to engagethe side of a slot 43 on the inner face of the extension portion of the bolt thereby causing the bolt to pass outwards to its partially extended position. To extend the bolt to its maxium extended position the key is revolved again, the inner tooth member 34' again forcing the L shaped locking member downwards, thereby disengaging the. extension portion 26 from a second notched'portion 44 on the lower side of the bolt. On this second revolution the outer tooth 33 of 'thefkey engagesa diagonal surface'45 of a cuta way portion on theupper edge of the extension portion,'thereby moving the bolt structure to its extended 7 position.

On theupper surface of the bolt extension portion at the inner end thereof there is provided a; cut-away portion 46 and whenthe bolt has been extended to'its maximum outer position the vertical portion 4.7 of this cut-away pertio'n' is engaged by a vertical "slide member 48 As heretofore stated the bolt is urged to a retracted position by means of the spring 27' and, accordingly, whenthe slide 48 is retractedothereby disengaging itself from the vertical portion 4'7 of the inner end of the bolt, the bolt will be drawn inwards to the midway position where it is stopped by the engagement between the portion 44 of the bolt and the extensionportion 26 of the -L shaped locking member 20. Retraction of the slide member 48 is accomplished in the fbllowing manner: I, p v

The slide member, which is illustrated in de-.

in Fig. 5, is provided with an .L shaped extension portion 55 having an aperture 56 there- 'broadly as is consistent with the priorart.

through. The plate 10 is provided with a housing 57 having a semi-cylindrical key guide 58 and a key aperture 59. A plate 60 is pivotally secured at 61 to the outer surface of the housing 57, said plate having an inwardly extending pin 62 which passes through an elongated slot 63 in the adjacent portion of the housing 5'7, this pin passing into the aperture 56 in the L shaped portion 55 of the slide 48, all as shownin detail in Fig. 8. Thus, when it is desired to retract the bolt the key is inserted inthe semi-cylindrical guide member 58 just far enough so that the outer tooth of the key passes into the housing 5'7 and the inner tooth 34 remains on the outside. The key is then rotated and the inner tooth 34 engages the pivotallymounted plate 60, thereby raising same the. slide member 48, thereby releasing the bolt and permitting it to retract under the influence of the spring 47 to its central position. The key is then moved into the slot 38 in the housing 37, as at the start, and given a half turn, the inner tooth 34 lowering the locking member 20 and the outer tooth 33 engaging the side of cut-a-way portion; 43 of the bolt thereby moving the bolt inwards to the fully retracted position. i

b I have illustrated the teeth for the key as-having scrolls or cut-a-way portions 66, the key aperture 59in the housing 57 being shaped to receive said key. It is obvious from the previous description that these scrolls or cut-a-way portions in'the key and. the corresponding scrolls in the key aperture 59 have nothing to do with the actuation of the bolt, these scrolls being designed primarily to prevent the introduction of foreign key into the lock Accordingly, if it is desired to provide one lock structure and a plurality of keys, only one of which is to be used in one of said looks, a plate having a key aperture therein may be screwed or otherwise secured to the housing 5'7, and inorder to provide, a plurality of difierentlocks, a plurality of plates and keys may be prepared. Thus, if it is desired to change the lock -so-that it'cannot be opened by. one possessing a former key, a new plate may be inserted on the housing and a difierent keyemployed to correspond with this plate.

,The hereinbefore described construction admits of considerable modification without departing fromythe invention; therefore, it is the wish not to be limited to the precise arrangements shown and described, which are as aforesaid-by way of illustration merely. In other words; the scope of protection contemplated is to be taken solely from theappended claims, interpreted as What I claim e p r 1. In a lock of the class described, the combination of a casing, a retractableboltpositioned within said casing, said bolt having a plurality of key engaging portions andstop member engaging slots along the upper and lower edges thereof, and a longitudinal guide slot.therein, -a. guide screw passingthrough said guide slot, a pivoted stop member mounted below said bolt and adapted tofbe released upon actuation of a key,

a slideable stop member mountedabove-said bolt and adapted toengage said bolt-when the latter is in a fully extended position; said-casing havinga key slot therein, azkey, housing mounted within said casing and having a key slot atright' ing, a longitudinally moveable bolt mounted within said casing, said bolt having key engaging portions and stop member engaging portions along the upper and lower edges thereof, a stop member mounted below said bolt and adapted to be released upon actuation of a key, a slidable stop member mounted above said bolt and adapted to engage said bolt when the latter is in a fully extended position, said casing having a key slot therein, an internal key housing mounted within said casing and having an offset key slot therein in order that the key must be given a partial turn after entering the casing, before it may enter the 5 key housing.

LUIGI TREVISIN. I 

